Population inversion in thallium by flashlamp-photodissociation of TII

Oleg S. Vasyutinskii

Alexander V. Baranov

Oleg S. Vasyutinskii, A.G. Evseev, Dmitriy V. Kuprianov +2 more

A.G. Evseev, Dmitriy V. Kupriyanov, B. V. Picheyev +2 more

William T. Walter, Steven Jarrett

Photodissociation of TlBr and CsBr by the 1850-Å mercury resonance line could lead to laser transitions at 5350 Å and 2.93 μ in Tl and Cs, respectively. The transition probabilities of Cs are such that radiative decay will maintain a population inversion between the 72P3/2 and 72S½ levels. Calculations indicate that a gain of 4% per m is expected at a temperature of 890° for photodissociation into the 72P3/2, ½ Cs levels. In Tl, however, the 62P3/2 level is metastable. A suitable quenching gas must be found before oscillation is possible at 5350 Å from photodissociation into the 72S½ level. Nitrogen and CO2 have been tried thus far without success.

J. C. White, Don O. Henderson

Selective photodissociation of TlCl and TlI using 248 nm radiation from a KrF* excimer laser has been used to create a Tl* (6p^{2}P\deg_{3/2}) metastable state population inversion. Stimulated anti-Stokes Raman emission at 376 nm has been observed using a 532 nm pump laser. Output power at the anti-Stokes wavelength and conversion efficiencies are reported.